Circuit for detecting ground offset of parts of a network
First Claim
1. A method of detecting the ground offset of parts of a network system, more particularly of testing the ground contact between network control units, where data are sent and received over at least one bus system, characterized in[a] that in the idle state of at least one bus line (10, 12) provided for receiving data and/or of at least one receiver line (24), after a predefinable first time period has elapsed, the level voltage (14) of this at least one bus line (10, 12) is scanned and compared with at least one predefinable limit or reference potential value (80),[b] that if the limit or reference potential value (80) is exceeded, at least one ground error signal (82) is generated, and[c] that in dependence on the fact whether until a predefinable second time period has elapsed, which is started at the same time as the predefinable first time period and is longer than the predefinable first time period,[c.1] the idle state of the at least one bus line (10, 12) or of the at least one receiver line (24) is still there, or[c.2] the idle state of the at least one bus line (10, 12) or of the at least one receiver line (24) is no longer there, the ground error signal is acknowledged or not acknowledged, respectively.
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Accused Products
Abstract
To improve a method as well as a circuit arrangement (100) for detecting the ground offset of parts of a network system, more particularly for checking the ground contact between network control units where data are sent and received over at least one bus system so that, on the one hand, prior to a breakdown event already a warning can be obtained in this respect that the state of the ground connection between the control units is no longer optimal but, on the other hand, ground defects are not shown by mistake, there is proposed '"'"'a! that in the idle state at least one bus line provided for receiving data and/or of at least one receiver line (24), after a predefinable first time period has elapsed, the level voltage (14) of this at least one bus line is scanned and compared with at least one predefinable limit or reference potential value, '"'"'b! in that if the limit or reference potential value is exceeded, at least one ground error signal is generated, and '"'"'c! in that in dependence on the fact whether until a predefinable second time period has elapsed, which is started at the same time as the predefinable first time period and is longer than the predefinable first time period, '"'"'c.1! the idle state of the at least one bus line or of the at least one receiver line (24) is still there, or '"'"'c.2! the idle state of the at least one bus line or of the at least one receiver line (24) is no longer there, the ground error signal is acknowledged or not acknowledged, respectively.
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Citations
10 Claims
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1. A method of detecting the ground offset of parts of a network system, more particularly of testing the ground contact between network control units, where data are sent and received over at least one bus system, characterized in
[a] that in the idle state of at least one bus line (10, 12) provided for receiving data and/or of at least one receiver line (24), after a predefinable first time period has elapsed, the level voltage (14) of this at least one bus line (10, 12) is scanned and compared with at least one predefinable limit or reference potential value (80), [b] that if the limit or reference potential value (80) is exceeded, at least one ground error signal (82) is generated, and [c] that in dependence on the fact whether until a predefinable second time period has elapsed, which is started at the same time as the predefinable first time period and is longer than the predefinable first time period, [c.1] the idle state of the at least one bus line (10, 12) or of the at least one receiver line (24) is still there, or [c.2] the idle state of the at least one bus line (10, 12) or of the at least one receiver line (24) is no longer there, the ground error signal is acknowledged or not acknowledged, respectively.
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6. A circuit arrangement (100) for detecting the ground offset of parts of a network system, more particularly for checking ground contact between network control units while data can be sent and received over at least one bus system, characterized by
at least one comparator unit (70) which is assigned to at least one bus line (10, 12) provided for the received data and leading to at least one receiver unit (20), while in the idle state of this at least one bus line (10, 12) and/or at least one receiver line (24) connected downstream of the receiver unit (20), after a first time period has elapsed that can be predefined by at least a first timer unit (30), the level voltage (14) of this at least one bus line (10, 12) can be scanned and compared to at least one predefinable limit or reference potential value (80) by means of the comparator unit (70), at least a first switch or trigger element (40) connected downstream of the first timer unit (30) for buffering at least one ground error signal (82) produced by the comparator unit (70) when the limit or reference potential value (80) is exceeded, at least a second switch or trigger element (60) connected downstream of at least a second timer unit (50) for taking over or transferring the ground error signal (82) for the case where the idle state of the at least one bus line (10, 12) or of the at least one receiver line (24) still exists until a second time period that can be predefined by the second timer unit (50) has elapsed, which second time period is started at the same time as the predefinable first time period and lasts longer than the predefinable first time period.
Specification